I have been looking for a ring for my husband for our anniversary and the only sites that I have found that have any rings of any quality are the Masters of Design and maybe this site -
http://www.greekforme.com/sigma-nu.html - they have some rings that are relatively simple - good for daily wearing - hope this helps - I am ordering the Legion of Honor ring from the Masters of Design. (I wanted to say thanks to the reply that explained that custom jewelry can be expensive - he is right - and it was a good post). I hope this site at least gives you some more options because there are not many out there.
Sigma Nu ring
Threaded Mode